body {
    margin: 0;
}
.nav {
    position: fixed;
    left: 0;
    top: 0;
    width: 100%;
    height: 40px;
    line-height: 40px;
    background-color: #fff;
    border-bottom: 1px solid #eee;
}
.nav-inner {
    position: relative;
    width: 1000px;
    margin: 0 auto;
}
.nav-item {
    display: inline-block;
    text-decoration: none;
}
.btn {
    display: inline-block;
    width: 80px;
    height: 36px;
    line-height: 36px;
    font-size: 12px;
    background-color: #3c9cfe;
    color: #fff;
    text-align: center;
    cursor: pointer;
    text-decoration: none;
    border-radius: 4px;
}
.btn:hover {
    background-color: #2390ff;
}
.nav-btn {
    position: absolute;
    right: 0;
    top: 2px;
}
.wrapper {
    width: 960px;
    margin: 50px auto 0 auto;
}
h2 {
    font-size: 18px;
}
article {
    padding: 15px;
    margin-bottom: 10px;
    background-color: #f5f6f7;
    border-radius: 5px;
}
time {
    font-size: 12px;
}
